I have the same problem, I upgraded my iPhone 4 to 4.3.3 and now my wifi isn't working. I tried resetting network settings and that didn't work either. I upgraded my iPad 2 to 4.3.3 and the wifi works fine.

I have the same problem. After upgrade to iOS 4.3.2 the wifi did not work. Only my wifi at home to what the iphone was connected during upgrade does not work. Other wifi's at work and in other places were detected and connected to.

Reset all network settings-did not work

Switch power off and on - did not work

choosing others in settings/network/wifi and entering the name and password of the network - did not work (Error: "could not find the network")

I upgrade to 4.3.2 about a week ago, and since that point have not been able to use my WiFi connection.

Weird thing is, at first it said (no WiFi) under the network options, then a few days ago it changed back to the normal on/off WiFi option. Tried to enable it but didnt get a network list with available networks. typing in my network settings didnt do it either; got the same error you did.

Even tried restoring old iPhone backups but that just didnt do nothing but screw up my calender and contacts, not rollback iOS version like I thought it would.

Resetting the network settings worked for me although my problem could have been different. Mine would connect into an authenticating wifi network like at McDonalds or in a hotel but when I opened a web page, the login page would not come up so I was connected but could do anything. Reset the network settings and then it worked. First time I have ever had this problem with upgrading.

I've been following a ton of threads with this problem and am ever hopeful that I've found a "solution", even if it would need to tested over time:

My TimeCapsule had the channel setting at 'automatic' and defaulted to channel 11, so I manually changed it to another channel (tried to pick one that doesn't come up too often when scanning for other home wireless networks). So far, my connectivity issues with my iPhone 4 (and iOS 4.3.3.) have vanished! My iPhone connects immediately and (so far ... about 2 hours) has remained connected.

Sure, there should be a fix to this issue to come from Apple (iOS 5?, if not 4.3.4), but as a workaround it seems to work.

Factory reset did not work! The iphone can't detect my time capsule WiFi. After the unsuccessful attempt to connect to the WiFi, I could at least do the sync with iTunes and got my data back. Maybe the problem could be solved by undoing the upgrade to iOS 4.3.3 and reinstalling iOS 4.3.1. Does anyone knows how this has to be done?

I had the same problem, after update my iphone iOS to 4.3.3 version it could not connect to my home wifi network anymore (but it could connect to wifi at work with no problem), and now it just fail some times, taking like 5 minutes to connect when it fails and the solution was change the Wifi Security from WEP to WPA-PSK/WPA2-PSK. The problem is still there, but now i can use the iPhone at wifi. We hope that the next update fix this problem (i didn't have any problem with 4.3.2 version). My Router is a D-Link DI-524/150.

Thought I would correct myself... resetting worked ok for the hotel I am staying in but then it did not work at Burger King this morning. Very frustrated. I hope Apple understands that this is an issue. They don't make going back all that easy.

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